25
It has been to the United States.
12
62900471853
485 (four hundred eighty five) years !
17 animals have been etinct in the past 200 years
From 1646 to 2011 there have been 88 leap years.
It has been 55 years since 1966.
There have been about 6,300 tornadoes in the U.S. in the past 5 years with more worldwide.
10
many improvement have been made over years
There has been 250 Olympics have been held have been in the last thousand years.
In the years 2000-2010 there have been 13,817 tornadoes confirmed in the United States.
17
its about 5098billion
25
their must not been any for the past ten years/twenty years